Collema ryssoleum (Tuck.) A. Schneid.

Collema ryssoleum (Tuck.) A. Schneid.

Guide Study Lich.: 181, 1898. Basionym: Collema nigrescens var. ryssoleum Tuck. - Lich. Calif.: 34, 1866.

Synonyms: Collema meridionale Hue; Collema nigrescens f. rupestre (Bagl.) Zahlbr.; Lathagrium nigrescens var. rupestre Bagl.

Distribution: N - Lig (Watson 2014, Giordani & al. 2016). C - Tosc (Pišút 1997, Tretiach & al. 2008), Laz (Tretiach 2004, Genovesi & al. 2011), Sar (Nöske 2000, Rizzi & al. 2011). S - Camp (Nimis & Tretiach 2004), Cal (Puntillo 1996), Si (Grillo & al. 1996, Ottonello & Romano 1997, Grillo 1998, Grillo & Caniglia 2004, Ottonello & al. 2011).

Description: Thallus foliose, homoiomerous, subgelatinous when wet, membranous and adnate, broadly lobed, 1-6 cm in diam. Lobes 0.4-1 cm wide, 50-85 µm thick when wet (but much thicker on the ridges and pustules), rounded and often somewhat ascending at apex, densely pustulate and coarsely ridged, dark olive-green to brown or rarely black, often pale yellowish brown in older parts. Lower surface greenish brown, with a few, scattered, white hapters. Upper and lower cortices absent. Apothecia common, lecanorine, crowded, (0.3-)0.5-1(-1.5) mm across, with a flat to convex, brownish red to black disc and an entire, persistent thalline margin. Thalline exciple usually pseudocorticate; proper exciple thin, euthyplectenchymatous; epithecium brownish; hymenium colourless, 80-110 µm high, I+ blue; paraphyses coherent, simple or sparingly branched, 2-3 µm thick at mid-level, the apical cells swollen; hypothecium colourless or pale yellow-brown. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores 4-7-septate, hyaline, ellipsoid to fusiform, straight or slightly curved, 22-47 x 4-11 µm, with pointed ends. Pycnidia immersed or semi-immersed, on both sides of the thallus, pale. Conidia bacilliform or with slightly swollen ends, 4-5 x c 1 µm. Photobiont cyanobacterial (Nostoc, the cells in long chains). Spot tests: all negative. Chemistry: without lichen substances.

Note: a mild-temperate, mainly western species in Europe, found on steeply inclined seepage tracks of moderately acid to basic siliceous rocks at low elevations; restricted to the Tyrrhenian ecoregion in Italy.

Growth form: Foliose, broad lobed

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly sexual

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: rather rare

Humid mediterranean belt: rather common

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (9424)
2001/12/04

Manuel Gil

Spain, Canary Islands, Barranco Chafaril, Lanzarote

Degelius G. 1954. The lichen genus Collema in Europe: Morphology, Taxonomy, Ecology. Symbolae Bot. Upsal. 13, 2: 1-499.

Manuel Gil

Spain, Canary Islands, Tenerife

Manuel Gil

Spain, Canary Islands, Tenerife

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_C/Textes_C5/Collema_ryssoleum.htm; Owner: -

France, Nonza - Corse
25/10/2012

Felix Schumm - CC BY-SA 4.0

[VZ1598], Bulgaria. Pontus Euxinus. Distr. Sozopol. 5 km ad meridiem versus a pago Sozopol, 3-5 m. Ad scopulum maritimum. Leg. A. V zda, 20.09.1978. - EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1598.

Felix Schumm - CC BY-SA 4.0

[VZ1598], Bulgaria. Pontus Euxinus. Distr. Sozopol. 5 km ad meridiem versus a pago Sozopol, 3-5 m. Ad scopulum maritimum. Leg. A. V zda, 20.09.1978. - EX A. V ZDA: LICHENES SELECTI EXSICCATI NR. 1598.

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

Ulrich Kirschbaum - CC BY-SA 4.0

Spain, Canary Islands, La Gomera, on volcanic rocks

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